膦酸盐
光致发光
光激发
配体(生物化学)
热稳定性
聚结(物理)
密度泛函理论
材料科学
量子效率
化学
光化学
化学工程
分析化学(期刊)
光电子学
计算化学
有机化学
原子物理学
激发态
受体
工程类
物理
天体生物学
生物化学
作者
Javad Shamsi,Dominik Kubicki,Miguel Anaya,Yun Liu,Kangyu Ji,Kyle Frohna,Clare P. Grey,Richard H. Friend,Samuel D. Stranks
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2020-05-15
卷期号:5 (6): 1900-1907
被引量:85
标识
DOI:10.1021/acsenergylett.0c00935
摘要
Quantum-confined CsPbBr3 nanoplatelets (NPLs) are extremely promising for use in low-cost blue light-emitting diodes, but their tendency to coalesce in both solution and film form, particularly under operating device conditions with injected charge-carriers, is hindering their adoption. We show that employing a short hexyl-phosphonate ligand (C6H15O3P) in a heat-up colloidal approach for pure, blue-emitting quantum-confined CsPbBr3 NPLs significantly suppresses these coalescence phenomena compared to particles capped with the typical oleyammonium ligands. The phosphonate-passivated NPL thin films exhibit photoluminescence quantum yields of ∼40% at 450 nm with exceptional ambient and thermal stability. The color purity is preserved even under continuous photoexcitation of carriers equivalent to LED current densities of ∼3.5 A/cm2. 13C, 133Cs, and 31P solid-state MAS NMR reveal the presence of phosphonate on the surface. Density functional theory calculations suggest that the enhanced stability is due to the stronger binding affinity of the phosphonate ligand compared to the ammonium ligand.
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